S-91259A814 1/2"-13 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in high-stress applications
• Precise Class 3A thread fit ensures secure fastening and vibration resistance in demanding industrial environments
• 5" shoulder length with tight tolerances provides accurate alignment and smooth rotation for machinery components
• Black oxide finish offers corrosion resistance and enhanced durability in various operating conditions
• Knurled socket head with 5/16" hex drive allows for secure tool grip and easy installation in confined spaces
• Alloy steel construction with Rockwell C32 hardness delivers superior strength and wear resistance for long service life
• Coarse 1/2"-13 UNC threads enable quick assembly and disassembly while maintaining holding power

Professional Applications & Engineering Value

This high-strength shoulder screw addresses critical alignment and rotational requirements in precision machinery and industrial equipment. The 5" shoulder length with controlled diameter tolerance provides exact positioning for bearings, gears, and pivoting mechanisms, eliminating misalignment issues that cause premature wear. The alloy steel construction with Rockwell C32 hardness ensures the screw maintains dimensional stability under heavy loads and repetitive motion. The black oxide finish protects against corrosion in manufacturing environments while the knurled socket head prevents tool slippage during torque application. These shoulder screws are engineered for applications requiring precise axial location and rotational freedom, making them ideal for automation equipment, conveyor systems, and precision assemblies where reliability is paramount.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with 1/2"-13 UNC coarse threads and right-hand thread direction. The shoulder maintains tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 material standards, this component is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental regulatory compliance for industrial applications worldwide.